   Theorem 2.12 [1]}
For every n-inner product space  \(\left(\,X \,,\, \left<\,\cdot \,,\, \cdot \;|\; \cdot \,,\, \cdots \,,\, \cdot \,\right> \,\right)\) ,
\(\left\Vert \,x_{\,1} \,,\, x_{\,2} \,,\, \cdots \,,\, x_{\,n}\,\right\Vert  \,=\, \sqrt{\left<\,x_{\,1} \,,\, x_{\,1} \;|\; x_{\,2} \,,\, \cdots \,,\, x_{\,n}\,\right>}\) 
